But doctors can be helpful.
I was once in poor health. Feeling tired, suffering from high cholesterol and gaining weight despite not eating much.
He told me to drop saturated fats, simple sugars and animal protein. And instead choke on complex carbs, vegetables and vegetable oils.
The doctor was fat himself, so the contrarian in me did the natural thing and went 180 on his advice: dropped complex carbs, vegetables and oils and instead choked on saturated fats, simple carbs (even sugar and candy) and animal protein.
I was once in poor health.